1212979712 has 80 divisors (see below), whose sum is σ = 2826753600. Its totient is φ = 519773184.

The previous prime is 1212979673. The next prime is 1212979739. The reversal of 1212979712 is 2179792121.

It is a self number, because there is not a number n which added to its sum of digits gives 1212979712.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172163 + ... + 179069.

It is an arithmetic number, because the mean of its divisors is an integer number (35334420).

Almost surely, 2^1212979712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212979712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1413376800).

1212979712 is an abundant number, since it is smaller than the sum of its proper divisors (1613773888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1212979712 is an frugal number, since it uses more digits than its factorization.

1212979712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6946 (or 6916 counting only the distinct ones).

The product of its digits is 31752, while the sum is 41.

The square root of 1212979712 is about 34827.8582746628. The cubic root of 1212979712 is about 1066.4762271126.

The spelling of 1212979712 in words is "one billion, two hundred twelve million, nine hundred seventy-nine thousand, seven hundred twelve".